body {
  background-color: rgb(20,20,20);
  color: rgb(255, 255, 255);
}

ul {
  display: flex;
}

li {
  list-style: none;
  margin: 1px 5px;
}

header {
  display: flex;
  border-radius: 4px;
  border: solid grey 1px;
}

footer {
  display: flex;
  justify-content: center;
  border-radius: 4px;
  border: solid grey 1px;
}
